Method for determining real world measurements from an apparel 3d model

ABSTRACT

This invention is Continuation-in-part to Ser. No. 15/633,533 and outlines a method for using a specific type of 2D vector, namely a straight line, to compute and display real world measurements on a 3D model by calculating the path distance of the 2D vector. The specification for Ser. No. 15/633,533 is included here by reference and the terms have the same meaning. The additions are fully supported in the original specification. No new matter is added.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1: A 3D model and its corresponding UV map

FIG. 2: The manufacturing pattern corresponding to the UV map

FIG. 3: Shows one embodiment of this invention

DETAILED DESCRIPTION OF THE INVENTION

This invention outlines a method for computing and displaying real world measurements from a 3D model using a 2D vector in conjunction with the 3D model's UV map and its corresponding manufacturing pattern. The 3D model is created such that its UV map is a true representation of its corresponding manufacturing pattern and is to scale. By using any of the well known techniques, any point on the 3D model can be correlated to its corresponding point on the UV map. Since the UV map is a scaled representation of its corresponding manufacturing pattern, any point on the 3D space can be mapped to its corresponding 2D vector in the UV space and consequently to its corresponding points on the manufacturing pattern.

FIG. 1 shows a 3D model and its corresponding UV map. The UV map is a true representation of its corresponding manufacturing pattern and is to scale.

FIG. 2 shows the manufacturing pattern which was the basis for creating the UV map. The manufacturing pattern is a CAD vector file and includes its real dimensions. Since the UV is a scaled version of its manufacturing pattern, we can know the scale factor as:

Scale Factor=Width of the manufacturing pattern for a Mesh Group/Width of UV map corresponding to the same Mesh Group

Since the scaling is uniform, the Scale Factor would be the same if we used Height instead of Width or we used any other mesh group instead of Front.

FIG. 3 shows one embodiment of this invention. In this embodiment, two points A and B are selected on the 3D model. The two corresponding points on the UV map namely P & Q are then determined and the path length or distance between them is calculated as:

Path Length between two points P(x1,y1) and Q(x2,y2) is given by: d(P,Q)=√(x2−x1)²+(y2−y1)²

Using the path length d(P,Q) and the Scale Factor, we can compute the real world length as:

Real Length is given by: r(P,Q)=d(P,Q)*Scale Factor

In another embodiment of this invention, a series of points can be selected on the 3D model and the real world distance can be determined by computing the sum of the measurements for each segment, such segment comprising each consecutive pair of points.

In yet another embodiment of this invention, an arc can be used instead of a straight line and the path distance and its corresponding real world measurement can be computed. 

1. A method for determining real world measurements from an apparel 3D model, the method comprising: Creating a 3D model with its UV map corresponding to its manufacturing pattern and to scale by 1:Scale Factor Selecting at least two points on the said 3D model Creating a 2D Vector comprising the points on the UV map corresponding to the said points on the 3D model Computing the Path Length of the said 2D Vector Calculating the Real Length as Path Length*Scale Factor 